As far as I learnt... there three main factors influence BP, the volume, the pump and the vessel. If your blood volume decreased... the BP will crash. If the pump from the heart is not sufficient, the BP will also low. If your vessel's hole is wide (dilated), the BP will go down. Now... what you need to do is finding which of the three causing your BP crash. If you just add more caffeine to your supplement expecting your BP will up..., without concerning the volume..., your effort will be useless.
Therefore I encourage you to discuss with your doctor about what is the main cause of your BP crash.... then you can determine the best intervention. Best of luck.
My doctor is the reason I am in this situation, she can't help me. But it really is the volume because I am being sucked out with fluids.
But I have to consider that my heart maybe is getting bigger and not pumping efficiently anymore. So it came to my idea to constrict my blood vessels via caffeine, it also invigorates the heart.